static void
init_interface(void)
{
block_io_op_t op;
reset_interface();
if (blk_ring == NULL) {
op.cmd = BLOCK_IO_OP_RING_ADDRESS;
(void)HYPERVISOR_block_io_op(&op);
blk_ring = (blk_ring_t *)uvm_km_valloc_align(kernel_map,
PAGE_SIZE, PAGE_SIZE);
pmap_kenter_ma((vaddr_t)blk_ring, op.u.ring_mfn << PAGE_SHIFT,
VM_PROT_READ|VM_PROT_WRITE);
DPRINTF(XBDB_SETUP, ("init_interface: "
"ring va %p and wired to %p\n",
blk_ring, (void *)(op.u.ring_mfn << PAGE_SHIFT)));
blk_ring->req_prod = blk_ring->resp_prod =
resp_cons = req_prod = last_req_prod = 0;
event_set_handler(_EVENT_BLKDEV, &xbd_response_handler,
NULL, IPL_BIO);
hypervisor_enable_event(_EVENT_BLKDEV);
}
__insn_barrier();
state = STATE_ACTIVE;
}
static void reset(JNIEnv *env, jobject thiz, jstring jName)
{
const char *name = jName ? env->GetStringUTFChars(jName, NULL) : NULL;
if (!name) {
jniThrowNullPointerException(env, "name");
return;
}
if (reset_interface(name) < 0) {
throwException(env, SYSTEM_ERROR, "Cannot reset interface");
}
env->ReleaseStringUTFChars(jName, name);
}